Inspired by the Morsbags movement, September's challenge is to take a reusable bag with you every time you shop, instead of using the disposable plastic bags give out by stores.
According to the Morsbags website, over 1 million plastic bags are consumed per minute, worldwide. They've only been around for about 30 years, but they may take closer to 500 years to degrade (no-one really knows - plastic wasn't invented 500 years ago). So every single plastic bag that has ever been made still exists somewhere, whether it's buried in a landfill, or fluttering gaily from a tree (where I believe they are termed "witches' knickers"), or filling up the stomach of a minke whale.
You cannot throw them away. There is no "away". But if you buy or make a sturdy reusable bag and remember to take it with you when you go shopping, you can avoid perhaps 150-200 plastic bags. That's approximately how many we each use per year.
Take the challenge. Carry a bag. And don't forget to vote in the poll in the right-hand sidebar.